This is one of those cases where I favor relationship anarchy; it's ultimately up to me and my partner to decide where our boundaries are. Each relationship is a unique thing. I like partitions.
HOWEVER, while I won't dictate what other partners do with my metamours, there can be consequences! If I have a partner who's fluid bonded with someone and then there's an STD scare, you better believe I will be abstinent with that partner until all the tests done. I do this to protect myself and my other partners. But I trust my partners to make the best decisions and to be responsible and safe.
But, honestly, to me, condoms are an emotionally neutral item. From a strictly pragmatic standpoint condoms are generally a good idea. They stop yeast infections (which SUCK!) and also make cleanup much quicker.